mayhem-firmware/firmware/application/clock_manager.hpp

/*
 * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
 *
 * This file is part of PortaPack.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef __CLOCK_MANAGER_H__
#define __CLOCK_MANAGER_H__

#include "string_format.hpp"
#include "ch.h"
#include "hal.h"

#include "i2c_pp.hpp"
#include "si5351.hpp"

#include "lpc43xx_cpp.hpp"
using namespace lpc43xx;

class ClockManager {
   public:
    enum ReferenceSource {
        Xtal,      /* 10 MHz crystal onboard the HackRF */
        PortaPack, /* 10 MHz TCXO on 20180820 and newer PortaPack revisions. */
        External,  /* HackRF external clock input SMA, or from PortaPack with TCXO feature. */
    };
    using ReferenceFrequency = uint32_t;

    typedef struct {
        ReferenceSource source;
        ReferenceFrequency frequency;
    } Reference;

    constexpr ClockManager(
        I2C& i2c0,
        si5351::Si5351& clock_generator)
        : i2c0(i2c0),
          clock_generator(clock_generator),
          reference({ReferenceSource::Xtal, 10000000}) {
    }

    void init_clock_generator();
    void shutdown();

    void start_audio_pll();
    void stop_audio_pll();

    void set_base_audio_clock_divider(const size_t divisor);

    void enable_codec_clocks();
    void disable_codec_clocks();

    void enable_if_clocks();
    void disable_if_clocks();

    void set_sampling_frequency(const uint32_t frequency);

    uint32_t get_sampling_frequency() const {
        return _base_band_frequency;
    };

    void set_reference_ppb(const int32_t ppb);

#ifdef PRALINE
    // Si5351 diagnostic methods
    uint8_t si5351_read_status() { return clock_generator.device_status(); }
    uint8_t si5351_read_register(uint8_t reg) { return clock_generator.read_register(reg); }
    void si5351_write_register(uint8_t reg, uint8_t value) { clock_generator.write_register(reg, value); }
#endif

    uint32_t get_frequency_monitor_measurement_in_hertz();

    Reference get_reference() const;
    std::string get_source();
    std::string get_freq();

    void enable_clock_output(bool enable);

   private:
    I2C& i2c0;
    si5351::Si5351& clock_generator;
    Reference reference;

    uint32_t _base_band_frequency{20000000};

    void set_gp_clkin_to_clkin_direct();

    void start_frequency_monitor_measurement(const cgu::CLK_SEL clk_sel);
    void wait_For_frequency_monitor_measurement_done();

    void set_m4_clock_to_irc();

    void set_m4_clock_to_pll1();

    uint32_t measure_gp_clkin_frequency();

    ReferenceSource detect_reference_source();
    Reference choose_reference();
    bool loss_of_signal();
};

#endif /*__CLOCK_MANAGER_H__*/